/*
 * TI OMAP on-chip I2C controller.  Only "new I2C" mode supported.
 *
 * Copyright (C) 2007 Andrzej Zaborowski  <balrog@zabor.org>
 * Copyright (C) 2009 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include "hw/hw.h"
#include "hw/i2c/i2c.h"
#include "hw/arm/omap.h"
#include "hw/sysbus.h"

#define TYPE_OMAP_I2C "omap_i2c"
#define OMAP_I2C(obj) OBJECT_CHECK(OMAPI2CState, (obj), TYPE_OMAP_I2C)

#define I2C_MAX_FIFO_SIZE (1 << 6)
#define I2C_FIFO_SIZE_MASK ((I2C_MAX_FIFO_SIZE) - 1)

typedef struct OMAPI2CState {
    SysBusDevice parent_obj;

    MemoryRegion iomem;
    qemu_irq irq;
    qemu_irq drq[2];
    I2CBus *bus;

    uint8_t revision;
    uint32_t fifosize;
    void *iclk;
    void *fclk;

    uint16_t mask;
    uint16_t stat;
    uint16_t we;
    uint16_t dma;
    uint16_t count;
    int count_cur;
    uint16_t sysc;
    uint16_t control;
    uint16_t own_addr[4];
    uint16_t slave_addr;
    uint8_t sblock;
    uint8_t divider;
    uint16_t times[2];
    uint16_t test;
    int fifostart;
    int fifolen;
    uint8_t fifo[I2C_MAX_FIFO_SIZE];
} OMAPI2CState;

/* I2C controller revision register values */
#define OMAP1_INTR_REV    0x11
#define OMAP2_INTR_REV    0x34
#define OMAP3_INTR_REV    0x3c
#define OMAP3630_INTR_REV 0x40

static void omap_i2c_interrupts_update(OMAPI2CState *s)
{
    qemu_set_irq(s->irq, s->stat & s->mask);
    if ((s->dma >> 15) & 1)					/* RDMA_EN */
        qemu_set_irq(s->drq[0], (s->stat >> 3) & 1);		/* RRDY */
    if ((s->dma >> 7) & 1)					/* XDMA_EN */
        qemu_set_irq(s->drq[1], (s->stat >> 4) & 1);		/* XRDY */
}

static void omap_i2c_fifo_run(OMAPI2CState *s)
{
    int ack = 1, i;

    if (!i2c_bus_busy(s->bus))
        return;

    if ((s->control >> 2) & 1) {				/* RM */
        if ((s->control >> 1) & 1) {				/* STP */
            i2c_end_transfer(s->bus);
            s->control &= ~(1 << 1);				/* STP */
            s->count_cur = s->count;
            s->fifolen = 0;
        } else if ((s->control >> 9) & 1) {			/* TRX */
            while (ack && s->fifolen) {
                ack = (i2c_send(s->bus, s->fifo[s->fifostart++]) >= 0);
                s->fifostart &= I2C_FIFO_SIZE_MASK;
                s->fifolen--;
            }
            s->fifolen = 0;
            s->stat |= 1 << 4;					/* XRDY */
        } else {
            for (i = 0; i < 4; i++)
                s->fifo[(s->fifostart + i) & I2C_FIFO_SIZE_MASK] =
                    i2c_recv(s->bus);
            s->fifolen = 4;
            s->stat |= 1 << 3;					/* RRDY */
        }
    } else {
        if ((s->control >> 9) & 1) {				/* TRX */
            for (; ack && s->count_cur && s->fifolen; s->count_cur--) {
                ack = (i2c_send(s->bus, s->fifo[s->fifostart++]) >= 0);
                s->fifostart &= I2C_FIFO_SIZE_MASK;
                s->fifolen--;
            }
            s->stat &= ~0x4410;                     /* XDR | XUDF | XRDY */
            if (ack && s->count_cur) {              /* send more? */
                /* we know that FIFO is empty */
                if (s->revision < OMAP3_INTR_REV)
                    s->stat |= 1 << 4;              /* XRDY */
                else {
                    if (s->count_cur > (s->dma & 0x3f)) /* XTRSH */
                s->stat |= 1 << 4;				/* XRDY */
            else
                        s->stat |= 1 << 14;         /* XDR */
            }
            }
            if (!s->count_cur)                      /* everything sent? */
                s->stat |= 1 << 2;                  /* ARDY */
        } else {                                    /* !TRX */
            for (; s->count_cur && s->fifolen < s->fifosize; s->count_cur--) {
                i = i2c_recv(s->bus);
                if (i < 0) break; /* stop receiving if nothing to receive */
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)(i & 0xff);
            }
            s->stat &= ~((1 << 3) | (1 << 13));            /* RRDY | RDR */
            if (s->fifolen) {
                if (s->revision < OMAP3_INTR_REV)
                    s->stat |= 1 << 3;                     /* RRDY */
                else {
                    if (s->fifolen > ((s->dma >> 8) & 0x3f)) /* RTRSH */
                s->stat |= 1 << 3;				/* RRDY */
            else
                        s->stat |= 1 << 13;                /* RDR */
                }
            } else if (!s->count_cur && (s->control & 2))  /* STP */
                s->stat |= 1 << 2;                         /* ARDY */
        }
        if (!s->count_cur) {
            i2c_end_transfer(s->bus);
            if ((s->control >> 1) & 1) {			/* STP */
                s->control &= ~0x0602;     /* MST | TRX | STP */
                s->count_cur = s->count;
            }
        }
    }

    s->stat |= (!ack) << 1;					/* NACK */
    if (!ack)
        s->control &= ~(1 << 1);				/* STP */
}

static void omap_i2c_reset(DeviceState *dev)
{
    OMAPI2CState *s = OMAP_I2C(dev);

    s->mask = 0;
    s->stat = 0;
    s->dma = 0;
    s->count = 0;
    s->count_cur = 0;
    s->we = 0;
    s->sysc = 0;
    s->fifolen = 0;
    s->fifostart = 0;
    s->control = 0;
    s->own_addr[0] = 0;
    s->own_addr[1] = 0;
    s->own_addr[2] = 0;
    s->own_addr[3] = 0;
    s->slave_addr = 0;
    s->sblock = 0;
    s->divider = 0;
    s->times[0] = 0;
    s->times[1] = 0;
    s->test = 0;
    
    i2c_end_transfer(s->bus);
}

static uint32_t omap_i2c_read(void *opaque, hwaddr addr)
{
    OMAPI2CState *s = opaque;
    int offset = addr & OMAP_MPUI_REG_MASK;
    uint16_t ret;

    switch (offset) {
    case 0x00:	/* I2C_REV */
        return s->revision;					/* REV */

    case 0x04:	/* I2C_IE */
        return s->mask;

    case 0x08:	/* I2C_STAT */
        ret = s->stat | (i2c_bus_busy(s->bus) << 12 );
        if (s->revision >= OMAP3_INTR_REV && (s->stat & 0x4010)) /* XRDY or XDR  */
            s->stat |= 1 << 10; /* XUDF as required by errata 1.153 */
        return ret;

    case 0x0c: /* I2C_IV / I2C_WE */
        if (s->revision >= OMAP3_INTR_REV)
            return s->we;
        if (s->revision >= OMAP2_INTR_REV)
            break;
        ret = ctz32(s->stat & s->mask);
        if (ret != 32) {
            s->stat ^= 1 << ret;
            ret++;
        } else {
            ret = 0;
        }
        omap_i2c_interrupts_update(s);
        return ret;

    case 0x10:	/* I2C_SYSS */
        return (s->control >> 15) & 1;				/* I2C_EN */

    case 0x14:	/* I2C_BUF */
        return s->dma;

    case 0x18:	/* I2C_CNT */
        return s->count_cur;					/* DCOUNT */

    case 0x1c:	/* I2C_DATA */
        ret = 0;
        if (s->fifolen) {
            if (s->revision < OMAP3_INTR_REV) {
                if (s->control & (1 << 14)) /* BE */
                    ret = (((uint16_t)s->fifo[s->fifostart]) << 8) 
                        | s->fifo[(s->fifostart + 1) & I2C_FIFO_SIZE_MASK];
                else
                    ret = (((uint16_t)s->fifo[(s->fifostart + 1) & I2C_FIFO_SIZE_MASK]) << 8) 
                        | s->fifo[s->fifostart];
                s->fifostart = (s->fifostart + 2) & I2C_FIFO_SIZE_MASK;
                if (s->fifolen == 1) {
                    s->stat |= 1 << 15;					/* SBD */
                    s->fifolen = 0;
                } else
                    s->fifolen -= 2;
                if (!s->fifolen) {
                    s->stat &= ~(1 << 3); /* RRDY */
                    s->stat |= 1 << 2;    /* ARDY */
                }
            } else {
                s->stat &= ~(1 << 7); /* AERR */
                ret = s->fifo[s->fifostart++];
                s->fifostart &= I2C_FIFO_SIZE_MASK;
                if (--s->fifolen) {
                    if (s->fifolen <= ((s->dma >> 8) & 0x3f)) {
                        s->stat &= ~(1 << 3);				/* RRDY */
                        s->stat |= 1 << 13;   /* RDR */
                    }
                } else {
                    s->stat &= ~((1 << 3) | (1 << 13)); /* RRDY | RDR */
                    s->stat |= 1 << 2;				/* ARDY */
                }
            }
            s->stat &= ~(1 << 11);					/* ROVR */
        } else if (s->revision >= OMAP3_INTR_REV)
            s->stat |= (1 << 7); /* AERR */
        omap_i2c_fifo_run(s);
        omap_i2c_interrupts_update(s);
        return ret;

    case 0x20:	/* I2C_SYSC */
        return s->sysc;

    case 0x24:	/* I2C_CON */
        return s->control;

    case 0x28: /* I2C_OA / I2C_OA0 */
        return s->own_addr[0];

    case 0x2c:	/* I2C_SA */
        return s->slave_addr;

    case 0x30:	/* I2C_PSC */
        return s->divider;

    case 0x34:	/* I2C_SCLL */
        return s->times[0];

    case 0x38:	/* I2C_SCLH */
        return s->times[1];

    case 0x3c:	/* I2C_SYSTEST */
        if (s->test & (1 << 15)) {				/* ST_EN */
            s->test ^= 0xa;
            return s->test;
        }
        return s->test & ~0x300f;
    case 0x40: /* I2C_BUFSTAT */
        if (s->revision >= OMAP3_INTR_REV) {
            switch (s->fifosize) {
            case 8:  ret = 0x0000; break;
            case 16: ret = 0x4000; break;
            case 32: ret = 0x8000; break;
            case 64: ret = 0xc000; break;
            default: ret = 0x0000; break;
            }
            ret |= ((s->fifolen) & 0x3f) << 8;  /* RXSTAT */
            ret |= (s->count_cur) & 0x3f;       /* TXSTAT */
            return ret;
        }
        break;
    case 0x44: /* I2C_OA1 */
    case 0x48: /* I2C_OA2 */
    case 0x4c: /* I2C_OA3 */
        if (s->revision >= OMAP3_INTR_REV)
            return s->own_addr[(addr >> 2) & 3];
        break;
    case 0x50: /* I2C_ACTOA */
        if (s->revision >= OMAP3_INTR_REV)
            return 0; /* TODO: determine accessed slave own address */
        break;
    case 0x54: /* I2C_SBLOCK */
        if (s->revision >= OMAP3_INTR_REV)
            return s->sblock;
        break;
    default:
        break;
    }

    OMAP_BAD_REG(addr);
    return 0;
}

static uint32_t omap_i2c_readb(void *opaque, hwaddr addr)
{
    OMAPI2CState *s = opaque;
    int offset = addr & OMAP_MPUI_REG_MASK;
    uint8_t ret;

    switch (offset) {
    case 0x1c: /* I2C_DATA */
        ret = 0;
        if (s->fifolen) {
            if (s->revision < OMAP3_INTR_REV) {
                if (s->control & (1 << 14)) /* BE */
                    ret = (((uint8_t)s->fifo[s->fifostart]) << 8)
                        | s->fifo[(s->fifostart + 1) & I2C_FIFO_SIZE_MASK];
                else
                    ret = (((uint8_t)s->fifo[(s->fifostart + 1) & I2C_FIFO_SIZE_MASK]) << 8)
                        | s->fifo[s->fifostart];
                s->fifostart = (s->fifostart + 2) & I2C_FIFO_SIZE_MASK;
                if (s->fifolen == 1) {
                    s->stat |= 1 << 15; /* SBD */
                    s->fifolen = 0;
                } else
                    s->fifolen -= 2;
                if (!s->fifolen) {
                    s->stat &= ~(1 << 3); /* RRDY */
                    s->stat |= 1 << 2;    /* ARDY */
                }
            } else {
                s->stat &= ~(1 << 7); /* AERR */
                ret = (uint8_t)s->fifo[s->fifostart++];
                s->fifostart &= I2C_FIFO_SIZE_MASK;
                if (--s->fifolen) {
                    if (s->fifolen <= ((s->dma >> 8) & 0x3f)) {
                        s->stat &= ~(1 << 3); /* RRDY */
                        s->stat |= 1 << 13;   /* RDR */
                    }
                } else {
                    s->stat &= ~((1 << 3) | (1 << 13)); /* RRDY | RDR */
                    s->stat |= 1 << 2;                  /* ARDY */
                }
            }
            s->stat &= ~(1 << 11); /* ROVR */
        } else if (s->revision >= OMAP3_INTR_REV)
            s->stat |= (1 << 7); /* AERR */
        omap_i2c_fifo_run(s);
        omap_i2c_interrupts_update(s);
        return ret;
    default:
        break;
    }

    OMAP_BAD_REG(addr);
    return 0;
}

static void omap_i2c_write(void *opaque, hwaddr addr,
                uint32_t value)
{
    OMAPI2CState *s = opaque;
    int offset = addr & OMAP_MPUI_REG_MASK;
    int nack;

    switch (offset) {
    case 0x00:	/* I2C_REV */
    case 0x10:	/* I2C_SYSS */
    case 0x40: /* I2C_BUFSTAT */
    case 0x50: /* I2C_ACTOA */
        OMAP_RO_REG(addr);
        break;
    case 0x04:	/* I2C_IE */
        if (s->revision < OMAP2_INTR_REV) {
            s->mask = value & 0x1f;
        } else if (s->revision < OMAP3_INTR_REV) {
            s->mask = value & 0x3f;
        } else if (s->revision == OMAP3_INTR_REV) {
            s->mask = value & 0x63ff;
        } else { /* omap3630 */
            s->mask = value & 0x6fff;
        }
        omap_i2c_interrupts_update(s);
        break;
    case 0x08:	/* I2C_STAT */
        if (s->revision < OMAP2_INTR_REV)
            OMAP_RO_REG(addr);
        else {
            /* RRDY and XRDY are reset by hardware. (in all versions???) */
            if (s->revision < OMAP3_INTR_REV) {
                value &= 0x27;
            } else if (s->revision == OMAP3_INTR_REV) {
                value &= 0x63e7;
            } else { /* omap3630 */
                value &= 0x6ee7;
            }
            s->stat &= ~value;
            omap_i2c_interrupts_update(s);
        }
        break;

    case 0x0c: /* I2C_IV / I2C_WE */
        if (s->revision < OMAP3_INTR_REV) {
            OMAP_RO_REG(addr);
        } else if (s->revision == OMAP3_INTR_REV) {
            s->we = value & 0x636f;
        } else { /* omap3630 */
            s->we = value & 0x6f6f;
        }
        break;

    case 0x14:	/* I2C_BUF */
        if (s->revision < OMAP3_INTR_REV)
            s->dma = value & 0x8080;
        else {
            s->dma = value & 0xbfbf;
            if ((value & (1 << 14))    /* RXFIFO_CLR */
                || (value & (1 << 6))) /* TXFIFO_CLR */
                s->fifolen = 0;
        }
        if (value & (1 << 15))					/* RDMA_EN */
            s->mask &= ~(1 << 3);				/* RRDY_IE */
        if (value & (1 << 7))					/* XDMA_EN */
            s->mask &= ~(1 << 4);				/* XRDY_IE */
        break;

    case 0x18:	/* I2C_CNT */
        s->count = value;					/* DCOUNT */
        break;

    case 0x1c:	/* I2C_DATA */
        if (s->revision < OMAP3_INTR_REV) {
            if (s->fifolen > 2) {
                /* XXX: remote access (qualifier) error - what's that?  */
                break;
            }
            if (s->control & (1 << 14)) {				/* BE */
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)((value >> 8) & 0xff);
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)(value & 0xff);
            } else {
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)(value & 0xff);
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)((value >> 8) & 0xff);
            }
        } else {
            if (s->fifolen < s->fifosize) {
                s->stat &= ~(1 << 7); /* AERR */
                s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                    (uint8_t)(value & 0xff);
            } else
                s->stat |= (1 << 7); /* AERR */
        }
        s->stat &= ~(1 << 10);					/* XUDF */
        omap_i2c_fifo_run(s);
        omap_i2c_interrupts_update(s);
        break;

    case 0x20:	/* I2C_SYSC */
        if (s->revision < OMAP2_INTR_REV) {
            OMAP_BAD_REG(addr);
            break;
        }

        if (value & 2) {
            omap_i2c_reset(DEVICE(s));
        } else if (s->revision >= OMAP3_INTR_REV) {
            s->sysc = value & 0x031d;
        }
        break;

    case 0x24:	/* I2C_CON */
        s->control = value & (s->revision < OMAP3_INTR_REV ? 0xcf87 : 0xbff3);
        if (~value & (1 << 15)) {				/* I2C_EN */
            if (s->revision < OMAP2_INTR_REV) {
                omap_i2c_reset(DEVICE(s));
            }
            break;
        }
        if (s->revision >= OMAP3_INTR_REV && ((value >> 12) & 3) > 1) { /* OPMODE */
            fprintf(stderr,
                    "%s: only FS and HS modes are supported\n",
                    __FUNCTION__);
            break;
        }
        if ((value & (1 << 10))) { /* MST */
            if (value & 1) { /* STT */
                nack = !!i2c_start_transfer(s->bus, s->slave_addr, /*SA*/
                                            (~value >> 9) & 1);			/* TRX */
                s->stat |= nack << 1;				/* NACK */
                s->control &= ~(1 << 0);				/* STT */
                s->fifolen = 0;
                if (nack)
                    s->control &= ~(1 << 1);			/* STP */
                else {
                    s->count_cur = s->count;
                    omap_i2c_fifo_run(s);
                }
                omap_i2c_interrupts_update(s);
            }
        }
        break;
    case 0x28: /* I2C_OA / I2C_OA0 */
        s->own_addr[0] = value & (s->revision < OMAP3_INTR_REV
                                  ? 0x3ff : 0xe3ff);
        /*i2c_set_slave_address(&s->slave[0],
          value & (s->revision >= OMAP3_INTR_REV
          && (s->control & 0x80)
          ? 0x3ff: 0x7f));*/
        break;

    case 0x2c:	/* I2C_SA */
        s->slave_addr = value & 0x3ff;
        break;

    case 0x30:	/* I2C_PSC */
        s->divider = value;
        break;

    case 0x34:	/* I2C_SCLL */
        s->times[0] = value & (s->revision < OMAP3_INTR_REV ? 0xff : 0xffff);
        break;

    case 0x38:	/* I2C_SCLH */
        s->times[1] = value & (s->revision < OMAP3_INTR_REV ? 0xff : 0xffff);
        break;

    case 0x3c:	/* I2C_SYSTEST */
        if (s->revision < OMAP3_INTR_REV) {
            value &= 0xf805;
        } else if (s->revision == OMAP3_INTR_REV) {
            value &= 0xf815;
        } else { /* omap3630 */
            value = (value & 0xf835) | 0x1c00;
        }
        if ((value & (1 << 15))) { /* ST_EN */
            fprintf(stderr, "%s: System Test not supported\n",
                    __FUNCTION__);
            s->test = (s->test & 0x0a) | value;
        } else {
            value &= ~0xff;
            s->test = (s->test & 0x1f) | value;
        }
        if (value & (1 << 11)) { /* SBB */
            if (s->revision >= OMAP2_INTR_REV) {
                s->stat |= 0x3f;
                if (s->revision >= OMAP3_INTR_REV) {
                    s->stat |= 0x6300;
                    if (s->revision > OMAP3_INTR_REV) {
                        s->stat |= 0x0c00;
                    }
                }
                omap_i2c_interrupts_update(s);
            }
        }
        break;

    case 0x44: /* I2C_OA1 */
    case 0x48: /* I2C_OA2 */
    case 0x4c: /* I2C_OA3 */
        if (s->revision < OMAP3_INTR_REV)
            OMAP_BAD_REG(addr);
        else {
            addr = (addr >> 2) & 3;
            s->own_addr[addr] = value & 0x3ff;
            /*i2c_set_slave_address(&s->slave[addr],
              value & ((s->control & (0x80 >> addr))
              ? 0x3ff: 0x7f));*/
        }
        break;
    case 0x54: /* I2C_SBLOCK */
        if (s->revision < OMAP3_INTR_REV)
            OMAP_BAD_REG(addr);
        else {
            s->sblock = value & 0x0f;
        }
        break;
    default:
        OMAP_BAD_REG(addr);
            break;
    }
}

static void omap_i2c_writeb(void *opaque, hwaddr addr,
                uint32_t value)
{
    OMAPI2CState *s = opaque;
    int offset = addr & OMAP_MPUI_REG_MASK;

    switch (offset) {
    case 0x1c:	/* I2C_DATA */
        if (s->revision < OMAP3_INTR_REV && s->fifolen > 2) {
            /* XXX: remote access (qualifier) error - what's that?  */
            break;
        }
        if (s->fifolen < s->fifosize) {
            s->fifo[(s->fifostart + s->fifolen++) & I2C_FIFO_SIZE_MASK] =
                (uint8_t)(value & 0xff);
            if (s->revision >= OMAP3_INTR_REV)
                s->stat &= ~(1 << 7); /* AERR */
            s->stat &= ~(1 << 10);					/* XUDF */
            omap_i2c_fifo_run(s);
        } else if (s->revision >= OMAP3_INTR_REV)
            s->stat |= (1 << 7);      /* AERR */
        omap_i2c_interrupts_update(s);
        break;
    default:
        OMAP_BAD_REG(addr);
            break;
    }
}

static const MemoryRegionOps omap_i2c_ops = {
    .old_mmio = {
        .read = {
            omap_i2c_readb,
            omap_i2c_read,
            omap_i2c_read,
        },
        .write = {
            omap_i2c_writeb, /* Only the last fifo write can be 8 bit.  */
            omap_i2c_write,
            omap_i2c_write,
        },
    },
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static int omap_i2c_bus_post_load(void *opaque, int version_id)
{
    OMAPI2CState *s = opaque;
    omap_i2c_interrupts_update(s);
    return 0;
}

static const VMStateDescription vmstate_omap_i2c = {
    .name = "omap_i2c",
    .version_id = 1,
    .minimum_version_id = 1,
    .post_load = omap_i2c_bus_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_UINT16(mask, OMAPI2CState),
        VMSTATE_UINT16(stat, OMAPI2CState),
        VMSTATE_UINT16(we, OMAPI2CState),
        VMSTATE_UINT16(dma, OMAPI2CState),
        VMSTATE_UINT16(count, OMAPI2CState),
        VMSTATE_INT32(count_cur, OMAPI2CState),
        VMSTATE_UINT16(sysc, OMAPI2CState),
        VMSTATE_UINT16(control, OMAPI2CState),
        VMSTATE_UINT16_ARRAY(own_addr, OMAPI2CState, 4),
        VMSTATE_UINT16(slave_addr, OMAPI2CState),
        VMSTATE_UINT8(sblock, OMAPI2CState),
        VMSTATE_UINT8(divider, OMAPI2CState),
        VMSTATE_UINT16_ARRAY(times, OMAPI2CState, 2),
        VMSTATE_UINT16(test, OMAPI2CState),
        VMSTATE_INT32(fifostart, OMAPI2CState),
        VMSTATE_INT32(fifolen, OMAPI2CState),
        VMSTATE_UINT8_ARRAY(fifo, OMAPI2CState, I2C_MAX_FIFO_SIZE),
        VMSTATE_END_OF_LIST()
    }
};

static int omap_i2c_init(SysBusDevice *sbd)
{
    DeviceState *dev = DEVICE(sbd);
    OMAPI2CState *s = OMAP_I2C(dev);

    if (!s->fclk) {
        hw_error("omap_i2c: fclk not connected\n");
    }
    if (s->revision >= OMAP2_INTR_REV && !s->iclk) {
        /* Note that OMAP1 doesn't have a separate interface clock */
        hw_error("omap_i2c: iclk not connected\n");
    }
    sysbus_init_irq(sbd, &s->irq);
    sysbus_init_irq(sbd, &s->drq[0]);
    sysbus_init_irq(sbd, &s->drq[1]);
    memory_region_init_io(&s->iomem, OBJECT(s), &omap_i2c_ops, s, "omap.i2c",
                          (s->revision < OMAP2_INTR_REV) ? 0x800 : 0x1000);
    sysbus_init_mmio(sbd, &s->iomem);
    s->bus = i2c_init_bus(dev, NULL);
    return 0;
}

static Property omap_i2c_properties[] = {
    DEFINE_PROP_UINT8("revision", OMAPI2CState, revision, 0),
    DEFINE_PROP_UINT32("fifo-size", OMAPI2CState, fifosize, 4),
    DEFINE_PROP_PTR("iclk", OMAPI2CState, iclk),
    DEFINE_PROP_PTR("fclk", OMAPI2CState, fclk),
    DEFINE_PROP_END_OF_LIST(),
};

static void omap_i2c_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
    k->init = omap_i2c_init;
    dc->props = omap_i2c_properties;
    dc->reset = omap_i2c_reset;
    /* Reason: pointer properties "iclk", "fclk" */
    dc->cannot_instantiate_with_device_add_yet = true;
    dc->vmsd = &vmstate_omap_i2c;
}

static const TypeInfo omap_i2c_info = {
    .name = TYPE_OMAP_I2C,
    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(OMAPI2CState),
    .class_init = omap_i2c_class_init,
};

static void omap_i2c_register_types(void)
{
    type_register_static(&omap_i2c_info);
}

I2CBus *omap_i2c_bus(DeviceState *omap_i2c)
{
    OMAPI2CState *s = OMAP_I2C(omap_i2c);
    return s->bus;
}

type_init(omap_i2c_register_types)
